ISO 2974:2026

This document specifies the dimensional requirements of end-connections for high-pressure fuel injection equipment components, including fuel injectors, CR injectors, common rails, distribution blocks, injection pumps and high-pressure supply pumps used on diesel (compression-ignition) engines.
It is applicable to externally threaded 60° concave cones (see Figures 1, 2, 5, and 6) and intended for use with high-pressure fuel injection pipe assemblies with tube outside diameters of:
— up to and including 12 mm for integral concave cones (see Table 1); and
— up to and including 9 mm for fabricated concave cones (see Table 2).